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Applied and Environmental Microbiology, March 2003, p. 1435-1441, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1435-1441.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Evaluation of Genetic Diversity among Pseudomonas citronellolis Strains Isolated from Oily Sludge-Contaminated Sites

Dhruva Bhattacharya, Priyangshu M. Sarma, S. Krishnan, Sanjeet Mishra, and Banwari Lal*

Centre of Bioresources and Biotechnology, TERI School of Advanced Studies, New Delhi 110003, India

Received 27 August 2002/ Accepted 19 December 2002

The diversity among a set of bacterial strains that have the capacity to degrade total petroleum hydrocarbons (TPH) in soil contaminated with oily sludge (hazardous hydrocarbon waste from oil refineries) was determined. TPH is composed of alkane, aromatics, nitrogen-, sulfur-, and oxygen-containing compound, and asphaltene fractions of crude oil. The 150 bacterial isolates which could degrade TPH were isolated from soil samples obtained from diverse geoclimatic regions of India. All the isolates were biochemically characterized and identified with a Biolog microbial identification system and by 16S rDNA sequencing. Pseudomonas citronellolis predominated among the 150 isolates obtained from six different geographically diverse samplings. Of the isolates, 29 strains of P. citronellolis were selected for evaluating their genetic diversity. This was performed by molecular typing with repetitive sequence (Rep)-based PCR with primer sets ERIC (enterobacterial repetitive intergenic consensus), REP (repetitive extragenic palindromes), and BOXAIR and PCR-based ribotyping. Strain-specific and unique genotypic fingerprints were distinguished by these molecular typing strategies. The 29 strains of P. citronellolis were separated into 12 distinguishable genotypic groups by Rep-PCR and into seven genomic patterns by PCR-based ribotyping. The genetic diversity of the strains was related to the different geoclimatic isolation sites, type of oily sludge, and age of contamination of the sites. These results indicate that a combination of Rep-PCR fingerprinting and PCR-based ribotyping can be used as a high-resolution genomic fingerprinting method for elucidating intraspecies diversity among strains of P. citronellolis.

* Corresponding author. Mailing address: Centre of Bioresources and Biotechnology, TERI School of Advanced Studies, Habitat Place, Lodhi Road, New Delhi 110003, India. Phone: 91 11 24682100. Fax: 91 11 24682144. E-mail: banwaril{at}teri.res.in.

Applied and Environmental Microbiology, March 2003, p. 1435-1441, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1435-1441.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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